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Awful one-liner
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| root@ip-10-14-10-142:~# export INSTANCE_ID=`ec2metadata --instance-id` | |
| root@ip-10-14-10-142:~# HOSTNAME=`aws ec2 describe-tags --region us-east-1 --filter "Name=resource-id,Values=$INSTANCE_ID" 'Name=key,Values=Name' | perl -ne 'chomp; my @a = split(/[ ]+/); next unless $a[1] eq "\"Value\":"; $a[2] =~ s/\"([\d\w\.\-]+)\".+/$1/; print "$a[2]\n"'` | |
| root@ip-10-14-10-142:~# hostname $HOSTNAME | |
| root@ip-10-14-10-142:~# echo $HOSTNAME | |
| www.example.com | |
| root@ip-10-14-10-142:~# echo $HOSTNAME > /etc/hostname |
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This presumes you've given the instance a tag of Name=.